The development of the CS valve used to the variable swash plate compressor for a vehicle air-conditioning system

Abstract

Since the variable swash plate type compressor used in the vehicle air-conditioning system is mounted on the engine and uses the power of the vehicle, many studies have been conducted on improving the performance of the compressor in order to increase the fuel efficiency of the vehicle. This study was also carried to improve compressor performance through the control room & suction muffler (CS) valve which is an on-off valve located between the control room and suction muffler. The swash plate angle can be controlled by the control room pressure adjusted with control gas. The flow of control gas starts from compressed high-pressure gas which is in the discharge muffler, flows into the control room through the external control valve (ECV) and then flows out to suction muffler through the CS hole which is located between the control room and suction muffler. Such this control method is using the compressed discharge refrigerant so that the compressor power is increased when the amount of the control gas is increased. Therefore, in this study, the CS valve has been developed to reduce the compressor power by minimizing the amount of control gas and it has been confirmed that the compressor power was reduced about 5~10% by the compressor operation speed.